FIGURE 10 in New fossil mussels (Bivalvia: Mytilidae) from Miocene hydrocarbon seep deposits, North Island, New Zealand, with general remarks on vent and seep mussels

FIGURE 10. Sketches of idealized internal right valves of adult specimens of Bathymodiolus heretaunga sp. nov., Gigantidas coseli sp. nov., and the two named modern species of Gigantidas Cosel and B. Marshall, 2003. Not to scale. A. B. heretaunga. B. G. c o s e l i. C. Gigantidas gladius Cosel and B. Marshall, 2003. D. Gigantidas horikoshii Hashimoto and Yamane, 2005. A and B based on holotype shell shapes but constructed as composites from details observed in several specimens for both new species. Features unknown in G. c o s e l i are estimated from those typical of the genus, and are drawn as dashed lines. C and D modified from Cosel and Marshall (2003: fig. 33) and Hashimoto and Yamane (2005: fig. 9) respectively. A: shell anterior length; aa: scar of anterior adductor; abr: scar of anterior byssal retractor; am: anterior margin; apb: scar of anterior part of posterior byssal retractor; b: beak; dm: dorsal margin; H: shell height; L: shell length; lig: ligament; pa: scar of posterior adductor; pbr: scar of posterior byssal retractor complex; pdc: posterodorsal corner; pl: pallial line; pm: posterior margin; ppb: scar of posterior part of posterior byssal retractor; u: umbo; vm: ventral margin.